#include <stdio.h>
int main ()
{
	int month;
	printf("please enter a month :\n");
	scanf("%d",&month);
	   switch(month)
	   {
	   	case 3:
	   	case 4:
		case 5:
			printf("%d is spring \n",month);
			break;
			case 6:
			case 7:
			case 8:
				printf("%d is summer \n",month);
				break;
			case 9:
			case 10:
			case 11:
			 	printf("%d is autumn \n",month);
				break;
			case 12:
			case 1:
			case 2:
				printf("%d is winter \n",month);
				break;
			default :
				printf("error!!!\n");	
		} 
		return 0;
		
}
